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Bean bugpests of leguminous crop, bean pests
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bean bug adult
Bean bug
Hemiptera, Alydidae

○ Scientific name : Riptortus clavatus (Thunberg)
○ Size : the length of its body is 1.5 cm 
○ Hosts : bean, pea, mung beans, kidney bean, leguminous crop, rice, millet and more
○ Distribution : Korea, Japan, Taiwan and more
 
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late-instar bean bug nymph
The body length of bean bug adult is 1.5 cm. Its waist is thin and third leg is longer. There are serrated prickles around the legs. The adult is 14~17 mm and its width is 2.5~3 mm. It is bigger than the average. A male bean bug has a black line on its head and chest and has a clear yellow discontinuity pattern. However, a female bean bug has light yellow line. The nymph's shape and behavior are similar with an ant.  
 
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early-instar bean bug nymph
Bean bugs did not cause serious damages. However, it appears everywhere after the number of predators of bean bug decreased due to chemical pesticide. It appears 2~3 times a year and stay over the coldest season as an adult on the weed which are around covering or left covering. It gives damage to the crop in spring.  The 1st generation of bean bug adult appears from late June to late July and the 2nd generation of the adult appears from early August to middle of September. 

The adults and larvae suck leguminous plant's juice. Therefore, a bean pod falls down or it becomes abnormal. Beans inside of pod stop growing and it turn into white or its surface becomes wrinkle.  Moreover, it damages the leguminous plants like pea, millit, and rice. Not only it attacks the crop's seed but also the fruit.

There are several eco-friendly ways to control bean bugs; pheromone trap, light trap, predators of bean bug, natural pesticide. If you see the below picture, you can see the light traps in the farm.  
 
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light traps to control bean bugs 

 Translated  by Sunyoung Cho

Other articles by Teokgi ParkInterviewed on : 2016.12.29 20:41

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#Hemiptera#Alydidae#Riptortus#pests of leguminouse crop#bean pests#spotted rice

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